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Add workaround for clang 3.3/3.4 #1350

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Apr 5, 2018
Merged

Add workaround for clang 3.3/3.4 #1350

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15 changes: 13 additions & 2 deletions include/pybind11/pybind11.h
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Original file line number Diff line number Diff line change
Expand Up @@ -1650,6 +1650,7 @@ void register_exception_translator(ExceptionTranslator&& translator) {
template <typename type>
class exception : public object {
public:
exception() = default;
exception(handle scope, const char *name, PyObject *base = PyExc_Exception) {
std::string full_name = scope.attr("__name__").cast<std::string>() +
std::string(".") + name;
Expand All @@ -1666,6 +1667,14 @@ class exception : public object {
}
};

NAMESPACE_BEGIN(detail)
// Returns a reference to a function-local static exception object used in the simple
// register_exception approach below. (It would be simpler to have the static local variable
// directly in register_exception, but that makes clang <3.5 segfault - issue #1349).
template <typename CppException>
exception<CppException> &get_exception_object() { static exception<CppException> ex; return ex; }
NAMESPACE_END(detail)

/**
* Registers a Python exception in `m` of the given `name` and installs an exception translator to
* translate the C++ exception to the created Python exception using the exceptions what() method.
Expand All @@ -1676,13 +1685,15 @@ template <typename CppException>
exception<CppException> &register_exception(handle scope,
const char *name,
PyObject *base = PyExc_Exception) {
static exception<CppException> ex(scope, name, base);
auto &ex = detail::get_exception_object<CppException>();
if (!ex) ex = exception<CppException>(scope, name, base);

register_exception_translator([](std::exception_ptr p) {
if (!p) return;
try {
std::rethrow_exception(p);
} catch (const CppException &e) {
ex(e.what());
detail::get_exception_object<CppException>()(e.what());
}
});
return ex;
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